I found _______ difficult to work out the problem.
A. it B. it’s C. that D. this
The Greens used to live in London and now they ________ in Beijing.
A. used to live B. are used to live
C. are used to living D. are used for living
The train was travelling _______ low speed at that time.
A. by B. in C. at D. with
— Have you ever been to Sanya? — Yes, ________already.
A. sometimes B. some time
C. sometime D. some times
—__________is it from Nanjing to Yangzhou? — About one hour’s bus ride.
A. How long B. How soon
C. How far D. How many hours
The song was so sweet. We couldn’t stop__________along.
A. singing B. to sing
C. to singing D. sang
